An obligate parasite, or holoparasite, is a parasitic organism that cannot complete its life-cycle without exploiting a suitable host.
Part of the Andes mountain range, Aconcagua is the second highest of the Seven Summits, behind only Mount Everest in Asia. At 22,837 feet (6,961 meters), not only is it the highest mountain in South America, it is the tallest peak in all of the Americas as well as the Southern and Western Hemispheres.
In fact, when measured by sea level, the tallest mountain peak outside of Asia is Aconcagua in Argentina that is 6,959 meters (22,831 feet). That puts it at about 485th of the world's tallest mountains.